How will you prove the formula sin(A−B)=sinAcosB−cosAsinB using formula of scalar product of two vectors?
1 Answer
Jun 27, 2016
See below
Explanation:
Consider two vectors representing parallelogram sides
We know that the parallelogram area is given by
then
substituting we obtain
We can also obtain the parallelogram area using the cross product.
so
Here
Note.